Steam-engine cross-head



I (NoModeL) L. D. DAVIS.

STEAM ENGINE (moss HEAD.

No. 394,345. Patented Dec. 11, 1888.

I uill! lllllll Inventor,

Z eananZ JPZQ vl' UNITED STATES PATENT OEEIcE.

LEONARD D. DAVIS, OF ERIE, PENNSYLVANIA.

STEAM-ENGINE CROSS-HEAD.

SPECIFICATION forming part of Letters Patent No. 394,345, dated December 11, 1888.

Application filed November 29, 1887. Serial No. 256,480. (No model.)

To all whom it may concern.-

lie it known, that I, LEONARD D. DAVIS, a citizen of the United. States, residing at Erie, in the county of Erie and State of Pennsylvania, have invented certain new and useful Improvements in Steam-Engine Cross-lleads; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, forming part of this specification.

My invention consists in the improvements in. steam-engine cross-heads hereinafter set forth and explained, and illustrated in the accompanying drawings, in which Figure 1 shows my improved cross-head partly in elet'ation and partly in section. Fig. 2 is a perspective view of one of the adjustable shoes used on my improved crosshead.

Like letters refer to like parts in both the figures.

In the construction of stean1-engines with stationary guides and adjustable cross-heads heretofore the shoes have been made to adjust sepzuately by means of set-screws and other like devices, and great difficultyhas been experienced in adjusting the shoes separately without getting the cross-head out of line with the cylinder and crank-pin. To overcome this difficulty, I make my shoes so that they are both adjusted at the same time and so that the adjustment of both shoes is alike, so that the adjustment of the crosshead cannot interfere with the lining up of the operative parts of the engine.

In the construction of my improved crosshead shown, A A are sections of the guides in which the cross-head operates, B the pistonrod, and O the connecting-rod, these parts being of the ordinary construction.

is secured to the piston-rml I make a projection or sleeve, E, into which the end G of the pistorrrod 13 is secured. on the outside of the sleeve F, I cut a sermv-thread, f, upon which the nut ll fits.

The nut H is provided with a groove, I, adapted to receive the ends of arms .I J on the ends of the shoes L L. The shoes L L are fitted one on each side of the cross-head M by means of diagonal joints N, so that when they are moved upward, by means of the grooved nut H operating on the arms J J, they are also moved outward against. the slides A A, so as to take up any wear, and, vice versa, the reverse movement of the nut ll moves the shoes L L back from the guides A A. In one of the sides of the shoes L L, I preferably cut slots 0, through which I insert set-screws P, which are tapped into the shell of the cross-head M, so that when the proper adjustment has been made by means of the nut II the set-screws P may be tightened up, so as to relieve the nut 11 of the strain caused by the friction of the shoes L L against the guides A A. I can, l'lOWGVGl, make my improved cross-head without the set-screws P, if desired.

Having thus described my invention, so as to enable others to construct and operate the same, what I claim as new, and desire to secur'e by Letters Patent of the United States,

1. The combination, in a cross-head of a steam-engine, of adjustable shoes on each side thereof, with a grooved nut adapted to move both shoes longitudinally at the same time, substantially as and for the purpose set forth.

2. The combination, in a cross-head of a steam-engine, of the body )I, having the screw-threaded sleeve 1* at one end thereof, and the grooved nut l-I, operating on said sleeve, with the shoes L L, having arms J J, o iierating in the groove in said nut, whereby said shoes may be simultaneouslymoved longitudinally, substantially as and for the purpose set forth.

3. The combination, in a steam-engine crosshead, of the diagonal slides N on the body of the eross-11ead and the shoes L L, having in- 'In testimony whereof I afiix my signature in olined faces N, operating longitudinally on presence oftwo witnesses. the slides N, and set-screws'P, for securing the shoes L L when adjusted, with the arms LEONARD D. DAVIS. 5 J J on said shoes and the grooved nut'H, env gaging with said arms for adjusting the shoes Vitnesses:

longitudinally, substantially as and for the F.,J. BASSETT,

purpose set forth. 7 H. J. OURTZE. 

